Product 1.USB charging, detachable, adjustable size: There is no need to worry about running out of power, it can be used for 150 hours on a single charge, and it can be charged via USB, and the meter head is easy to remove. 2.More suitable for babies and pregnant women No peculiar smell, suitable for pregnant women and children, more convenient than spray mosquito repellent. Without any smoke, toxic substances are released, which saves time and effort than holding mosquito swatter. 3.Application scenarios of ultrasonic mosquito repellent bracelet Silicone material, high-grade waterproof. Camping, outdoor, picnic, wild fishing, swimming, traveling, barbecue, hiking can be used. Efficient intelligent mosquito repellent bracelet, within a certain range, resist all mosquitoes, and they fear you who wear the mosquito-repellent bracelet. 4.Quiet and good sleep Wear a mosquito repellent watch, mosquitoes dare not approach you, avoid the trouble of hanging mosquito nets, and give you breathable, Quiet and good sleep. Product Features: Authoritative experiment proved effective Our designers and scientific researchers have studied the sound waves emitted by mosquitoes, moths, ants, and flies, and after repeated ultrasonic experiments, we have found a sound wave interval suitable for repelling insects to achieve the mosquito repellent effect. 1.USB Charging:Smart charging anti-mosquito bracelet, built-in smart chip, USB fast charging, 30 minutes of charging, 30 days of standby time, 130 hours of use, effectively avoiding more than 90% of mosquitoes 2.Three modes:Press once to turn on the switch to start the indoor mode; press again to switch the outdoor sports mode; press again to turn on the silent sleep mode; press the fourth time to turn off the device Product Specification: Color: Black Package Lists: 1 x Ultrasonic Mosquito Repellent Bracelet Watch